Double-Ring Inductor Layout for Low Coupling and High Q
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inductors face limitations such as high coupling, area occupation, and narrow bandwidth, making them unsuitable for various applications.
Innovation Solution
A double-layer inductor device with symmetric structure comprising first and second traces on different layers, coupled by a double ring inductor, reducing the need for a third layer and minimizing complexity and area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spiral inductor is used to achieve higher Q value and larger mutual inductance, then the inductance performance is improved, but coupling between the inductor and other devices increases and is hard to avoid
Solution Approach 1:
The patent employs asymmetric ground configurations where one side of the differential inductor has a continuous ground connection while the other side has a discontinuous or patterned ground. This asymmetric grounding creates magnetic field cancellation effects that reduce coupling with external devices while maintaining high Q value through optimized current distribution paths.
Solution Approach 2:
The patent converts the harmful coupling effect into a beneficial shielding mechanism by strategically placing ground traces and using return current paths that generate opposing magnetic fields. These opposing fields cancel out external interference and reduce mutual coupling, turning what would be harmful electromagnetic interaction into a protective shielding effect.
2Object-generated harmful factors
If an eight-shaped inductor with two sets of coils is used to reduce coupling between coils, then coupling is reduced, but the device occupies a larger area
Solution Approach 1:
The patent implements a nested configuration where the second inductor is positioned within or adjacent to the first inductor's structure. The inductors share common ground traces and utilize overlapping spatial regions, allowing one inductor to be effectively nested within the electromagnetic footprint of the other, thereby reducing total area while maintaining low coupling through differential signaling.
Solution Approach 2:
The patent merges the ground structures of multiple inductors into shared common ground traces. By combining ground paths and utilizing common reference planes, the patent reduces the total area required for separate ground connections while maintaining electrical isolation between signal paths through the differential configuration and strategic trace routing.
3Stability of the object's composition
If a twin inductor/transformer is used to achieve symmetric structure, then symmetry is improved, but the application bandwidth becomes relatively narrow
Solution Approach 1:
The patent implements dynamic bandwidth adjustment through variable capacitor configurations that can be tuned to different resonance frequencies. The circuit includes switchable capacitor banks and adjustable impedance matching networks that allow the symmetric inductor structure to adapt its electrical characteristics dynamically, extending operational bandwidth while maintaining structural symmetry for differential signaling.
Solution Approach 2:
The patent employs parameter adjustment mechanisms including variable capacitance values,可调 impedance transformations, and switchable resonance frequencies. By changing electrical parameters such as capacitance, inductance loading, and Q-factor through external control signals or switching networks, the symmetric structure can operate across multiple frequency bands and application scenarios without sacrificing its balanced configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design achieves higher gain and reduced circuit complexity while maintaining symmetry, enhancing the quality factor (Q) and minimizing the planar area.
Implementation Method 1
The double ring inductor is disposed on the first layer, located at an outside of the first trace and the third trace, and coupled to the first trace and the third trace
Data Source
AI summary
An inductor device includes a first trace, a second trace, a third trace, a fourth trace, and a double ring inductor. The first trace is disposed in a first area, and located on a first layer. The second trace is disposed in the first area, coupled to the first trace, and located on a second layer. The third trace is disposed in a second area, and located on the first layer. The fourth trace is disposed in the second area, coupled to the third trace, and located on the second layer. The double ring inductor is disposed on the first layer, located at outer side of the first trace and the third trace, and coupled to the first trace and the third trace.